Mac mini doesn't send sound to HP LA2206xc Monitor

I have attached my Mac Mini (late 2009) with a DVI - Mini DVI connector on a the HP LA2206xc Monitor, but I don't have any sound through the speakers of the monitor. Also the webcam doen't work with facetime.
Any ideas?

Hi,
I have attached the monitor with a displayport cable to the mini display port but no sound or video. Does the my Mac Mini (late 2009) support sound and video through the Mini DisplayPort or do I need to change something in my settings. I read somewhere that you could reset your pram?

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Mac mini doesn't send sound to HP LA2206xc Monitor

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